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Recently, vehicular radar systems are widely adopted to monitor various traffic accident situations on the road. Although the radar provides real-time object detection and high accuracy, it suffers from severe performance degradations when it is surrounded by unexpected obstacles such as traffic barrier and road side wall. In this paper, in order to analyze these problems, we conduct performance comparisons...
This paper describes vision-based target state estimation approaches for autonomous landing on a moving ground target. The state of moving ground target is estimated by using vision information from a gimbaled camera on an Unmanned Aerial Vehicle (UAV). Using the information from vision system, the UAV estimates the state of a moving target on the ground using the Unscented Kalman Filter (UKF). In...
Free space and on-road obstacle detection is one of the key functions for the implementation of the vision-based intelligent vehicle and robot navigation system. Stereo vision-based algorithm for this task is more realistic and precious compared with radar or lidar-based algorithms. In addition, accurate estimation results can indicate the current and approaching conditions in the complex traffic...
Recently, many automatic digital attendance systems are proposed by using advanced mobile device technologies. However, they do not provide a novel function of sensibility monitoring and counsel assistance. Although there are related works which explore personal emotion for further analysis via virtual environments, most previous works are not fully integrated into existing attendance system. In this...
This paper presents results of developing and operating a team of multiple unmanned aircraft system. It is a challenging task since the system complexity increases as the number of the unmanned aircraft increases. Given the autonomy of each vehicle in navigation, guidance, control, and vision-based missions, a system of multiple unmanned aircraft is constructed which is expected to be applied to complicated...
An all-digital PWM-based delta-sigma (ΔΣ) ADC is proposed. This system takes advantages of the duration of a pulse, rather than voltage or current, as the analog operand used in its closed-loop operation. Unlike VCO-based ADCs, this ADC as a linear input sampling stage with adequate uncalibrated performance. Furthermore, the architecture allows inherently matched multi-bit quantizer/DAC blocks by...
This paper focuses on unmanned aircraft guidance laws for a straight path and a circular orbit following using the vector field approach. The vector fields introduced in this paper can be applied to not only path following, but also other purposes such as arrival position, angle, and time control. Therefore, they could be applied to various missions providing advantages over other previous vector...
Using a Ni catalyst instead of Au, we synthesized a ZnO nanowall structure on a-plane (11–20) sapphire substrates by the vapor-liquid-solid technique under optimized conditions. We studied its structural properties and chemical composition using nanobeam diffraction with transmission electron microscopy (TEM) and scanning TEM-energy-dispersive spectroscopy. ZnO nanowalls about 100 nm thick with an...
Runtime environment is located in a middle layer of the AUTOSAR architecture to provide infrastructure services that enable not only the communication between software components, but also between software components and basic software components. An RTE generator is an automated generation tool for the AUTOSAR specification based RTE according to the ECU configuration. It generates a communication...
IP-based wireless sensor networks (IP-WSN) are popularly recognized as a global sensor networks infrastructure by combining IPv6 technology with wireless sensor networks (WSN). However, IP-WSN, currently, does not provide security because it is commonly recognized that it is a big burden for IP-WSN to adapt Internet's dominant security protocol. We suggest a security protocol for IP-WSN based on secure...
The AUTOSAR, an open and standardized automotive software platform, provides a software architecture that can develop automotive software components independent from specific base-hardware and operating systems. Therefore application system developers are able to focus on the implementation of software functionality regardless of variant ECU hardware and operating systems. As a consequence, the overall...
The AUTOSAR Basic Software is composed of Service Layer, ECU Abstraction Layer (EAL), Microcontroller Abstraction Layer (MCAL) and Complex Driver. In these components, an IO Driver Module including I/O Hardware Abstraction (IoHwAb) is one of the most important components in a development of ECU-target applications. However, it is difficult to integrate and emulate it to ECU-targets in coincidence...
The AUTOSAR consortium was founded to manage the growing electronics complexity and improve cost-efficiency without any compromises with quality as well as reusability. It is expected that AUTOSAR, open and standardized automotive software architecture, is widespread in automotive industry worldwide. In general, automotive embedded software has been closely coupled with the hardware, and the boundary...
The paper provides accuracy improvement of asynchronous UWB position location algorithm using multiple pulse transmission. We eliminate inter symbol interference by increasing time duration between consecutive pulses, and to reduce AWGN noise we transmitted sufficient number of pulses. At the receiver side we averaged signal over time, and performed correlation with template signal. The result shows...
A 0.5-to-2GHz frequency synthesizer PLL implemented in a 90nm CMOS technology uses a 1.0V supply and dissipates 0.6 and 1.2mW while operating at 1 and 2GHz, respectively. The PLL occupies an active die area of 0.02mm2. The current-controlled method based on a self-biased voltage-to-current converter enables the use of a small size loop filter and makes the PLL bandwidth insensitive to PVT variations...
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